### Interiors

Goodrich Corporation 3414 South Fifth Street Phoenix, Arizona 85040-1169 Tel: (602) 243-2200 Fax: (602) 243-2300



### LETTER OF TRANSMITTAL

TO: Holders of Goodrich Service Bulletin 25-349, Origin al Issue.


### SUBJECT: Goodrich Service Bulletin 25-349, Revision 1, Dated Jan 11/10.


### REASON: Revised Part Number Identification Table 4 to clari fy the use of Piston Plug P/N’s on

Regulator Valves.


### ACTION: Replace Goodrich Service Bulletin 25-349, Original Issue with Revision 1,

Dated Jan 11/10.


### HIGHLIGHTS
Revised Part Number Identification Table 4 to clari fy the use of Piston Plug P/N’s on Regulator Valves.

Previous Issues: Original - Sep 15/04 

### PAGE CHANGE 1 Added Data 2 Added Data 6 Added Data 8 Added Data 

### PAGE CHANGE

(END)

# INTERIORS

PHOENIX, ARIZONA 85040 

# SERVICE BULLETIN ATA SYSTEM: 25

25-349 Page 1 of 8 Orig. - Sep 15/04 Revision 1 - Jan 11/10 

# Subject: Equipment/Furnishings - Evacuation Systems -

TRANSMITTAL OF TECHNICAL DATA (EAR): THESE COMMODITIES, TECHNOLOGY OR SOFTWARE ARE CONTR OLLED BY THE U.S. EXPORT ADMINISTRATION REGULATIONS (EAR). DIVERSION CONTRARY TO U.S. LAW IS PROHIBITED. LICENSE EXCEPTION: NLR ECCN: 9E991 1. Planning Information A. Effectivity (1) Equipment - Boeing 737NG and MD-80/MD-90 emergen cy evacuation slides manufactured by Aircraft Interior Products, Goodrich Corporation, a nd its predecessors, as listed in Table 1, below, are affected by this Service Bulletin. NOTE: Revision 1 to this Service Bulletin does not change the technical content of this

action. Units modified under the previous issue ofthis Service Bulletin do not require additional modification. However, for regu lator valves used on B737 slides P/N 5A3086-301, 5A3088-301, and 5A3307-301 only, an additional check at next unit overhaul may be required. Refer to the Note f ollowing paragraph 1.A.(2) for information applicable to those units only.



### Table 1. Unit Effectivity NOMENCLATURE EVACUATION SYSTEM P/N AFFECTED UNIT S/N Slide, Fwd Door, LH/RH MD-80/MD-90 100504-201, -203 and -205 D9F001 thru D9F257
Slide, Aft Service Door MD-80/MD-90 100505-201 D9A001 thru D9A122
Slide, Tailcone MD-80/MD-90 100506-201 and -203 D9T001 thru D9T128



# Ream Vespel Piston Inner Diameter to Prevent Regulator Valve Hangfire

# Goodrich SERVICE BULLETIN



# 25-349 Page 2 of 8 Orig. - Sep 15/04 Revision 1 - Jan 11/10

THIS DOCUMENT SUBJECT TO THE CONTROLS AND RESTRICTIONS ON THE FIRST PAGE. (2) Action - Ream the inner diameter (ID) of the Ves pel piston to prevent hangfire of the regulator valve and loss of evacuation system functionality. NOTE: For regulator valve P/N’s 4A3865-4 and 4A3865-5 use d on B737 slide P/N’s

5A3086-301, 5A3088-301, and 5A3307-301 only, if the SB 25-349 action was accomplished by the optional action of replacing th e “single piece” Vespel piston P/N 3A3566-1 with the “two piece” Vespel piston P/N 3A3832-2, at the next unit overhaul verify that piston plug P/N 300382-1 is us ed. B. Reason (1) Description - Regulator valves on certain Goodri ch slide/rafts have not functioned (hangfired) during scheduled reliability deployments or during flat fire testing in the workshop. A hangfire of the regulator valve can prevent the evacuation syst em from being usable for evacuation. Analysis of the condition has concluded that the re gulator valve hangfire is caused by the Vespel piston coming into contact with the rod insi de the regulator valve. This results from constriction of the piston inner diameter due to th e stresses induced in the piston by the stored gas. Increasing the inner diameter (ID) of the pis ton will prevent this condition from occurring. As a secondary measure, a check of the piston ID isbeing added to the applicable maintenance documentation so that this critical dimension will be checked (and corrected, if necessary) at each valve overhaul. The regulator valves used on the B737NG and MD-80/M D-90 evacuation slides listed in Table 1, above, are similar to the regulator valve used on the slide/rafts mentioned above. Although the risk of hangfire is less on B737NG and MD-80/MD-90 valves than on the slide/raft systems because the B737NG and MD-80/MD-90 valves u se a lower stored gas pressure (3000 psig as compared to 3290 psig on those slide/raft s ystems), the change to the Vespel piston ID is being applied to the B737NG and MD-80/MD-90 valv es due to similarity of design. (2) Scope of Action - This Service Bulletin is a com plete and total measure. The units listed in Table 2, below, incorporate this modification at th e time of manufacture and are not affected by this Service Bulletin. Slide, Fwd Door, LH/RH B737NG 5A3086-1, -3 and -301 B3F001 thru B3F611
Slide, Aft Door, LH/RH B737NG 5A3088-1, -3 and -301 B3A001 thru B3A685
Slide, Fwd/Aft Door, LH/RH B737NG 5A3307-1, -3, -5 and -301 BNG0001 thru BNG5707 

### Table 1. Unit Effectivity (Cont.) NOMENCLATURE EVACUATION SYSTEM P/N AFFECTED UNIT S/N

# Goodrich SERVICE BULLETIN



# 25-349 Page 3 of 8 Orig. - Sep 15/04 Revision 1 - Jan 11/10

THIS DOCUMENT SUBJECT TO THE CONTROLS AND RESTRICTIONS ON THE FIRST PAGE. C. Description This Service Bulletin describes a modification (rea ming of the ID) to the Vespel piston in the regulat or valves used on the affected units listed in Table 1 , above, during a normal shop visit. D. Compliance Recommendation Goodrich recommends compliance with this Service Bu lletin at the next scheduled shop visit of the affected unit. E. Approval This Service Bulletin has been reviewed by the Fede ral Aviation Administration (FAA) and the repairs and modifications described herein comply with the applicable Federal Aviation Regulations (FAR's) and are FAA approved. F. Manpower Goodrich estimates that this Service Bulletin actio n can be conducted in approximately 30 minutes (0.5 hours) during normal evacuation system mainten ance. Goodrich will reimburse operators for labor expended in accomplishing this modification. G. Materials (1) Parts (a) No new parts other than those normally replaced during overhaul are required to perform this Service Bulletin action. (b) Replacing the Vespel piston with a new piston is an acceptable alternate means of compliance (Refer to Table 4, below, for part numbe r information). Contact Aircraft Interior Products, Goodrich Corporation, Phoenix Arizona (V0 ACH4) for a price quotation.



### Table 2. Modification Effectivity NOMENCLATURE EVACUATION SYSTEM P/N AFFECTED UNIT S/N Slide, Fwd Door, LH/RH MD-80/MD-90 100504-205 D9F258 and Subsequent
Slide, Aft Service Door MD-80/MD-90 100505-201 D9A123 and Subsequent
Slide, Tailcone MD-80/MD-90 100506-201 and -203 D9T129 and Subsequent
Slide, Fwd/Aft Door, LH/RH B737NG 5A3307-5 BNG5708 and Subsequent
NOTE: P/N 5A3086-( ) and 5A3088-( ) slides are no longer produced, so there is no new production

effectivity for these models.

# Goodrich SERVICE BULLETIN



# 25-349 Page 4 of 8 Orig. - Sep 15/04 Revision 1 - Jan 11/10

THIS DOCUMENT SUBJECT TO THE CONTROLS AND RESTRICTIONS ON THE FIRST PAGE. (2) Materials - Normal evacuation system maintenance materials are required. Refer to the applicable Goodrich Component Maintenance Manual (r eference Table 3, below) for this information. H. Tooling (1) To perform the check and reaming of the Vespel p iston, a drill press, a "V" block, a 0.139 inch or a 3.53 mm diameter four flute high speed steel ream er, a hand deburring tool, and pin gauges are required. (2) In addition, normal evacuation system maintenanc e tooling is required. Refer to the applicable Goodrich Component Maintenance Manual and Packing I nstructions (reference Table 3, below) for this information. I. Weight and Balance Not affected. J. Reference The following Goodrich publications were used in th e preparation of this Service Bulletin and should be referred to by maintenance personnel when perfor ming these actions.

K. Publications Affected Goodrich Component Maintenance Manuals 25-60-34, 25 -60-35 and 25-60-37 will require revision as a result of this Service Bulletin.



### Table 3. Reference Publications DOCUMENT DESCRIPTION APPLICATION 25-60-33 Component Maintenance Manual (CMM) MD-80/MD- 90 Slides 100504, 100505 and 100506 Series 25-60-34 CMM Reservoir Assembly 4A3699 Series 25-60-35 CMM Charged Cylinder Assemblies 4A3756 and 4A3904 Series 25-60-36 CMM B737NG Slides 5A3086 and 5A3088 Series 25-60-37 CMM B737NG Slide 5A3307 Series

# Goodrich SERVICE BULLETIN



# 25-349 Page 5 of 8 Orig. - Sep 15/04 Revision 1 - Jan 11/10

THIS DOCUMENT SUBJECT TO THE CONTROLS AND RESTRICTIONS ON THE FIRST PAGE. 2. Accomplishment Instructions WARNING: FOLLOW ALL WARNING AND CAUTION NOTES AND PROCEDURES IN THE

APPLICABLE GOODRICH MAINTENANCE DOCUMENTS (REFERENC E PARAGRAPH 1.J, ABOVE) WHEN PERFORMING THE FOLLOWING WORK PROC EDURES. NOTE: The following instructions assume that the unit hasbeen removed from the aircraft and is in

the workshop.

• The following instructions outline the process for reaming the Vespel piston during a scheduled shop visit/overhaul of the affected unit.

• Replacement of the Vespel piston with a new piston is an acceptable alternate means of compliance (Refer to Table 4, below, for part numbe r information). In addition, operators may elect to pre-position new or previously modified Ve spel pistons to form a rotable pool of pistons for accomplishing this modification in their fleet.

• Goodrich can perform the reaming operation at the G oodrich Service Centers for operators that elect to outsource the reaming operation. A. Unpack the evacuation system in accordance with t he DISASSEMBLY section of the applicable Goodrich Component Maintenance Manual (CMM) (refere nce Table 3, above). B. Remove the charged cylinder assembly in accordanc e with the applicable Goodrich CMM, DISASSEMBLY section. C. Move the charged cylinder assembly to the valve s hop. D. Discharge the cylinder in accordance with Goodric h CMM 25-60-34 or 25-60-35, as applicable, DISASSEMBLY section. E. Remove the regulator valve from the cylinder in a ccordance with Goodrich CMM 25-60-34 or 25-60-35, as applicable, DISASSEMBLY section. F. Disassemble the regulator valve in accordance wit h Goodrich CMM 25-60-34 or 25-60-35, as applicable, DISASSEMBLY section. G. Clean and inspect the retained regulator valve co mponents in accordance with Goodrich CMM 25-60-34 or 25-60-35, as applicable, CLEANING and C HECK sections.

# Goodrich SERVICE BULLETIN



# 25-349 Page 6 of 8 Orig. - Sep 15/04 Revision 1 - Jan 11/10

THIS DOCUMENT SUBJECT TO THE CONTROLS AND RESTRICTIONS ON THE FIRST PAGE. H. Check and ream the Vespel piston as follows. See Figure 1. (1) If necessary, allow the Vespel piston to come to room temperature. (2) Use pin gauges and check the inner diameter (ID) of the Vespel piston. (a) If the ID is greater than 0.139 inch (3.53 mm), discard and replace the Vespel piston. (Use P/N 3A3832-2 piston as the replacement part. When replacing P/N 3A3566-1 piston, a piston plug is also required to complete the assemb ly. See the Note following Table 4 for information about which piston plug to use.) (3) Use a 0.139 inch or 3.53 mm diameter four flute high speed steel reamer in a drill press set at approximately 700 rpm. Use a "V" block to hold the Vespel piston with the conical end towards the reamer (see Figure 1). Feed the reamer at a sl ow steady speed to ream the ID of the Vespel piston. CAUTION: TO PREVENT DAMAGE TO THE VESPEL PISTON/ROD SEAL SEA LING

SURFACES, USE CARE WHEN USING THE DEBURRING TOOL. (4) Use a hand operated deburring tool to remove bur rs from the edge of the reamed hole. See Figure 1. (5) Remove any chips and clean the Vespel piston in accordance with Goodrich CMM 25-60-34 or 25-60-35, as applicable, CLEANING secti on. (6) Use pin gauges to verify that the ID of the Vesp el piston is 0.137 - 0.139 inch (3.48 - 3.53 mm). (7) Scribe "-2" on the base surface of the Vespel pi ston in the area of shown in Figure 1 to indicate that the piston has been modified.

Figure 1.

Vespel Piston Reaming Dimensions

# Goodrich SERVICE BULLETIN



# 25-349 Page 7 of 8 Orig. - Sep 15/04 Revision 1 - Jan 11/10

THIS DOCUMENT SUBJECT TO THE CONTROLS AND RESTRICTIONS ON THE FIRST PAGE. I. Re-assemble the regulator valve in accordance wit h Goodrich CMM 25-60-34 or 25-60-35, as applicable, ASSEMBLY section. J. If the regulator valve will receive an updated da sh number (reference Table 4, below), cross out the old valve dash number on the valve nameplate and st amp the new valve dash number. K. For all regulator valves, use permanent ink and m ark the valve body adjacent to the valve nameplate with the information "SB 25-349" to indicate compli ance with this action. L. Test the regulator valve in accordance with Goodr ich CMM 25-60-34 or 25-60-35, as applicable, TESTING AND FAULT ISOLATION section. M. Install the regulator valve on the cylinder and r echarge in accordance with Goodrich CMM 25-60-34 or 25-60-35, as applicable, ASSEMBLY secti on. N. Mark the charged cylinder assembly as follows: (1) For all units, stencil the information "SB 25-34 9" adjacent to the charged cylinder assembly part number to indicate compliance with this action. O. Complete scheduled maintenance tasks on the unit, re-install the charged cylinder assembly and reclose the pack in accordance with ASSEMBLY section of the applicable Goodrich CMM or the applicable Goodrich Packing Instructions. P. Mark the evacuation system as follows: (1) For all units, permanently mark the girt adjacen t to the system identification placard with the information "SB 25-349" to indicate compliance with this action. Q. Record Service Bulletin compliance on the system information card.

# Goodrich SERVICE BULLETIN



# 25-349 Page 8 of 8 Orig. - Sep 15/04 Revision 1 - Jan 11/10

THIS DOCUMENT SUBJECT TO THE CONTROLS AND RESTRICTIONS ON THE FIRST PAGE. 3. Materials and Identification A. Parts No new parts are required to perform this modificat ion. B. Identification Component and system part numbers for specified end items and components are updated upon completion of these modifications. Block out the o ld dash number on the item and re-identify with the post-Service Bulletin dash number as shown in Table 4, below.

NOTE: *Vespel piston P/N 3A3832-2 requires a piston plug to complete the assembly. For regulator

valve P/N's 4A3697-1, 4A3697-2, and 4A3698-1 used o n MD-80/MD-90 slides, use Plug P/N 3A3833-1. For regulator valve P/N's 4A3865-2 a nd 4A3865-3 used on B737 slides, use Plug P/N 3A3833-1. For regulator valve P/N's 4A3865-4 a nd 4A3865-5 used on B737 slides, use Plug P/N 300382-1. For regulator valve P/N's 4A4047-2 a nd 4A4047-6 used on B737 slides, use Plug P/N 3A3833-1. (Plug P/N 300382-1 is an acceptable a lternate to P/N 3A3833-1 on valve P/N's 4A4047-2 and 4A4047-6 only.)



### Table 4. Part Number Information DESCRIPTION PRE-SB PART NUMBER POST-SB PART NUMBER EQUIVALENT NEW

PRODUCTION ITEM Piston, Vespel 3A3566-1 3A3566-2 3A3832-2 * Piston, Vespel 3A3832-1 3A3832-2 * 3A3832-2 * Valve, Regulator 4A3865-4 4A3865-5 4A3865-5 Valve, Regulator 4A4047-2 4A4047-6 4A4047-6 Charged Cylinder Assy. 4A3904-3 4A3904-5 4A3904-5 Charged Cylinder Assy. 4A3904-4 4A3904-6 4A3904-6